Half-cylinder 30941

Gutters have the shape of a half-cylinder. Their diameter is 20 cm, and the total length around the roof is 35 m. How much is sheet metal needed to make them? Add 15% to the connections.

Correct answer:

A =  12.6449 m2

Step-by-step explanation:

D=20 cm m=20:100  m=0.2 m r=D/2=0.2/2=101=0.1 m l=35 m  S1=π r l=3.1416 0.1 3510.9956 m2 q=100%+15%=1+10015=1.15  A=S1 q=10.9956 1.15=12.6449 m2



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